Nineteen other species of invertebrates are known: three species of early sirenian (sea cow), one partial skeleton of the primitive proboscidian Moeritherium, early mammals, sharks, crocodiles, three kinds of sawfish, rays, cartilaginous and bony fishes, several kinds of turtles, including a sea turtle and a sea snake.

Granted, there are sirenian workers who have, indeed, suggested that Atlantic rifting might explain manatee distribution … but, those workers were publishing their papers in the early years of the 20th century (Arldt 1907)!